“The war on Paid links is in full gear. Buying and selling links without the nofollow tag is now officially a black hat SEO practice that is against Google’s Webmaster Guidelines.

Google has and will continue to penalize sites that flagrantly buy and sell links. If you are buying or selling links: do it covertly & do it under the radar.

However, in many instances there may be a better option that trying to buy a link from a site: buy the site outright. While this won’t work for a large newspaper site, those links have long been void of link juice anyway. In fact, anyone who is openly selling may already have their link juice passing privileges revoked.”

If I told you Matt Cutts would kill me. Actually Matt has a number of posts on just that and he can explain it far more articulately than I can. But advertising it and coming out and saying so on your site might….just might…be a clue.